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See Chinese contents: GB/T 1511-2016 GB/T 1511-2016: Manganese ores -- Determination of calcium and magnesium contents -- EDTA titrimetric method
This Standard specifies the determination of calcium and magnesium contents in manganese ores by EDTA titration. This Standard applies to the determination of calcium and magnesium contents in manganese ores. The determination range (mass fraction): 0.75% ~ 18.00% for calcium, and 1.50% ~ 6.00% for magnesium.
